Sheet-metal roof



J. A. J. ANDERSSON.

SHEET METAL ROOFV APPLICATION FILED MAY 26, I921.

PatenM M. 24, 1922.,

J14; Ede/$072 Patented that. llQfiZ.

it at Joint sneer auitrus annnnsson, or Minoan, swtannn.

SHEET-METAL noor.

Application filed ma 26, 1921. serial No. trams.

.(saanrnnuimian THE raov sicns or run sea: as Marten a, items. We. 131a.

i To all whomitmayconoera.' i

Atoor Jum s Be it known that I, Jenn ANnnnssoN, a cit zen of Sweden, residing at Laholm, in the county of Halland, Sweden,

haveinvented certain new andfuseful Iniprovements nSheet-Metal Roofs (for which I have filed anapplication infiweden "on July 80,1919, Patent hlo. 46,899), ofwhich the following is a specification. j 1

My inventionrelatesto sheet metal roofing and has specialreference to a novel improvementiin such roofs whereby a. number of sheets placed adjacent to each .otheiybeconie. perfectly water-tight withoutusjing any soldering or welding. Theinanufacture of the sheets is very simple andcheap andthey can be placed in their position very easily and without using any skilled labourers.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a horizontal section through .rooling sheets cornnectedwith each other. Fig. 2 is a vertical section through some sheets connected with each other and Fig. 3 is a plan view of the same. i

The sheets 1 preferably being of a rectangular shape are at their lower edges folded inwards twice in such way that a double welt 2 is formed, and at their upper edges in the same manner folded twice out- Wards so that also here a double welt 3 is formed. In this way the sheet will be three- ;fold at the upper and lower edges. When applying the sheets on the roof one sheet. is slid sideways with its lower welt 2 into the upper welt 3 on the next sheet below, so that the welts engage each other, as shown in Fig. 2. At the side edges the sheets are first bent outwards forming a flange perpendicular to the plane of the sheet, and then this flange is folded as shown at 4 in Fig. 1. The

sheets are placed on the roof in such a way that these folded flanges 4 of two sheets adjacent to each other face each other at the same time as sheets placed above each other engage each other by their horizontal welts. The horizontal connections will be perfectly water-tight after the sheets have been placed on the roof without taking any other measures. This, however, is not the case in the vertical joints, where the sheets only face each other. In order also to make these joints water-tight without soldering or welding strips 5 are slid over the flanges 4: facing each other These strips 5 consist of sheet metal and are first folded longitiidinally whereafter the shanks thus formed are folded again inwards in such a manner that two {pockets are formed in each strip, each of said 1 pockets enclosing one of the folded parts the flanges 4. In this way also these jo nts will be watertight. The strips 5 are some- .whatlonger than the side edges of the sheets so that the former overlap the upper edges of thesheets, as shown at6 in Fig. 3. The lower end of the corresponding strip on the next sheet above is drawn over the upper end of the next strip below. In. order to make this possible the lower ends of the strips are notfolded as tightly as the rest of the strips,

punched for fastening the same to the roof by means of nails or the like. The tongue is flattened at the nailing after sliding the sheets together and is pressed down by the hammer blows in such a way that the adjacent sheet may be laid on top of the tongue andclose to the sheet carrying the tongue.

For the purpose of keeping water from the joints 4,5 the sheets 1 are preferably curved, as shown in Fig. l, in such a way that their centre-lines parallel with said joint are in a lower plane, the concave sides of the sheets being turned upwards. In this case the joints 4:, 5 preferably rest on triangular wooden laths nailed on to the roof so that the central lowest part of the sheets rests on .95 the roof.

It is not necessary to use a close boarding as the sheets can be laid on roofs having supports only under the tongues 7. The joints described and shown provide an effective strength and stiffness and gives the roof a great resistance to pressure.

Having thus described my invention what I ,claim and desire to secure by Letters Patent is i 1. A sheet metal roof made up of independent sheets, their meeting edges transverse the roof interfolded to secure said edges together, the edges of the strips formed by said. interconnected sheets extending no longitudinally of the roof being each bent upwardly and formed in relatively oppo sitely extending return bends, the upwardly bent portion at one corner of the sheet being cut away for permitting the extension of the sheet into a tab beyond the edge of the sheet adapted to be secured to the framing of the roof, and a strip overlying said edges and interlocking with the return bends for securing adjacent longitudinal sheets together, said strips being longer than the sheets to provide an overlapping cooperation of the strips, whereby each sheet is secured to the roof at all corners through the cooperation of the overlapped ends of the strips with the tabs.

2. A sheet metal roof made up of inde pendent sheets formed for interfitting rela tion along the edges transverse the roof to secure said edges together, the adjacent edges longitudinally of the roof each being formed with an outstanding flange having an oppositely disposed return bend, a strip overlying the adjacent longitudinal edges and inter looking with the return bends, said strips being longer than the sheets to provide overlapping portions with adjacent strips, and means formed on one corner of the sheet for securing it to the roof, whereby the overlapping ends of the strips cooperate with the projections on the sheets to secure all the corners of the sheets to the roof.

3. A sheet metal roof consisting of a plurality of sheets having double welts at their upper and lower edges engaging one another in adjacent sheets, said sheets having side flanges folded outwards and longitudinally folded strips cooperating with adjacent side flanges, said strips having shanks folded inwards and on -aging the outer parts of the flanges, the doiible welt at the upper edge at one side of the sheet projecting past the side flange and formed to provide a tongue to be directly secured to the roof,

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN ALGOT JULIUS ANDERSSOI.

Witnesses H. BRANZELL, E. BROJESSON. 

